Eevee render output is black. But it appears in cycles. What I did incorrectly during adjustment?
Having a bright, high contrast monitor and good vision, I'm able to see this picture is not completely black:

In future, you can try cranking up the Exposure in Render Properties tab  -&gt; Color Management section (or use compositor to increase contrast etc.) to see what's happening better:

As you can see, your character is cut in half. This happens because the character is overlapped by an object, which also blocks light, putting everything left in a deep shadow.
Right away when you open the uploaded project, you can see the problematic object on the bottom workspace region:

It's not problematic in viewport preview, because it was set to only display as a bounding box in the viewport:

The solution you probably want is to disable rendering of this object by clicking on a camera icon next to the object's name in the Outliner:

Then the render becomes this: